High again Mtpisgah,
Doe's the rear of yours go out roughly 3/4" to 1" at 45 Deg. then drop straight down around 3/8" to 1/4" like HotRodW's M photo OR Just drop straight down 3/8" to 1/4" like rboynton's photo?
My back looked the same as the M from the Pictures so i got M and it fitted perfectly.
Good luck.
